Machine room air conditioner synchronizing supercooling and superheating

Abstract

The invention discloses a machine room air conditioner synchronizing supercooling and superheating. The machine room air conditioner comprises a compressor, a condenser assembly, an expansion valve and an evaporator assembly which are all in sequential connection, wherein an outlet of the evaporator assembly is connected with an inlet of the compressor to form a refrigeration circulation loop. The condenser assembly comprises multiple branch condensing coils, a high-pressure liquid storage tank, a liquid collection device, a supercooling coil and a condenser fan, wherein the supercooling coil is arranged in a position with the best heat exchange effect in the condensing assembly and is parallel with the multi-branch condensing coil, an outlet of a branch condensing coil with the worst condensing effect in the multiple branch condensing coils is connected with an inlet of the high-pressure liquid storage tank, an outlet of the high-pressure liquid storage tank and outlets of other branch condensing coils are together connected with an inlet of the liquid collection device, and an outlet of the liquid collection device is connected with an inlet of the expansion valve though the supercooling coil. The machine room air conditioner effectively resolves the problems of loss of the obtained degree of the supercooling, avoids wet compression of the compressor, and can improve refrigeration performance and working stability of the machine room air conditioner.

Description

technical field [0001] The invention belongs to the technical field of building environment and equipment engineering, and relates to a machine room air conditioner. Background technique [0002] A computer room air conditioner is a unitary air conditioner that provides features such as air circulation, air filtration, cooling, reheating, and humidity control to computer and data processing rooms. The computer room air conditioning system has certain requirements on the subcooling degree, and it is often necessary to increase the refrigerant subcooling degree to improve the cooling energy efficiency ratio of the computer room air conditioner. [0003] Invention patent CN200910033112.6 A computer room air conditioner with a large subcooling degree. The refrigerant enters the multi-branch condensing coil and the air for heat exchange and condensation. Enter the subcooling coil for subcooling treatment, thereby increasing the subcooling degree of the refrigerant. [0004] Due...

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Problems solved by technology

[0006] Therefore, the invention patent CN200910033112.6 a computer room air conditioner with a large subcooling degree sacrifices the refrigerant subcooling capacity of the branch circuit with good heat exchange on the one hand, and on the other hand must increase the area of ​​the subcooling coil to compensate or regain The degree of subcooling required by the refrigeration system reduces the heat exchange effect of the condenser and reduces the refrigeration energy efficiency ratio of the refrigeration system; secondly, it increases the area of ​​the subcooling coil virtually and increases the initial investment of the equipment.

[0007] In addition, it is worth noting that the superheat of the refrigerant imported by the compressor often needs to be controlled at 5°C to 11°C: if the superheat is too low, the compressor will easily form wet compression, which will affect the stability and safety of the refrigeration system; if the superheat is too high , the exhaust temperature of the compressor is too high, the input power of the compressor increases, the performance of the refrigeration system decreases, and its stability and safety are not guaranteed

Invention patent CN200910033112.6 A computer room air conditioner with large supercooling degree, without considering the problem of refrigerant superheat degree control

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